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43 lines
1.9 KiB
43 lines
1.9 KiB
8 months ago
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# The ptrace system call is used for interprocess services,
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# communication and introspection (like synchronisation, signaling,
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# debugging, tracing and profiling) of processes.
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#
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# Usage of ptrace is restricted by normal user permissions. Normal
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# unprivileged processes cannot use ptrace on processes that they
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# cannot send signals to or processes that are running set-uid or
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# set-gid. Nevertheless, processes running under the same uid will
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# usually be able to ptrace one another.
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#
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# Fedora enables the Yama security mechanism which restricts ptrace
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# even further. Sysctl setting kernel.yama.ptrace_scope can have one
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# of the following values:
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#
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# 0 - Normal ptrace security permissions.
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# 1 - Restricted ptrace. Only child processes plus normal permissions.
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# 2 - Admin-only attach. Only executables with CAP_SYS_PTRACE.
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# 3 - No attach. No process may call ptrace at all. Irrevocable.
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#
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# For more information see Documentation/security/Yama.txt in the
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# kernel sources.
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#
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# The default is 1., which allows tracing of child processes, but
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# forbids tracing of arbitrary processes. This allows programs like
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# gdb or strace to work when the most common way of having the
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# debugger start the debuggee is used:
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# gdb /path/to/program ...
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# Attaching to already running programs is NOT allowed:
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# gdb -p ...
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# This default setting is suitable for the common case, because it
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# reduces the risk that one hacked process can be used to attack other
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# processes. (For example, a hacked firefox process in a user session
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# will not be able to ptrace the keyring process and extract passwords
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# stored only in memory.)
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#
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# Developers and administrators might want to disable those protections
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# to be able to attach debuggers to existing processes. Use
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# sysctl kernel.yama.ptrace_scope=0
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# for change the setting temporarily, or copy this file to
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# /etc/sysctl.d/20-yama-ptrace.conf to set it for future boots.
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kernel.yama.ptrace_scope = 0
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